Valve Replacement
Is your radiator valve stuck or leaking? Do you have a faulty isolation valve, gate valve, or thermostatic radiator valve (TRV)? AG Heating provides expert valve replacement services across London and Hertfordshire — fast, reliable, and carried out by Gas Safe registered engineers.
5★ reviews
By our customers
Across London, Hertfordshire & beyond
10+ years
Of Experience
Years of gas and heating expertise
Gas Safe
Registered & Fully Insured
Registration #973229
24/7
Emergency Callouts
Always available when you need us
Professional Valve Replacement Service
Valve Replacement Services
Whether you have a faulty thermostatic radiator valve (TRV), a leaking isolation valve, or a failed gate valve, AG Heating’s engineers diagnose and replace it quickly and correctly — minimising disruption and restoring your heating or plumbing to full working order.
A valve replacement from AG Heating includes:
- Rapid fault diagnosis and valve identification
- Replacement of thermostatic radiator valves (TRVs)
- Isolation valve replacement (under sinks, baths, toilets)
- Gate valve and ball valve replacement
- Lockshield valve replacement and balancing
- Zone valve replacement on heating systems
- Full system check after replacement
- Handover notes and advice on valve maintenance
Most valve replacements are completed within 1–2 hours, with minimal disruption to your home.
Do You Need a Valve Replaced?
A valve replacement is worth considering when:
✅ Your TRV is stuck open or closed, leaving a radiator too hot or cold
✅ You have a leaking valve causing damp or water damage
✅ An isolation valve won’t shut off water to a tap, toilet, or appliance
✅ A gate valve is seized and can no longer be operated
✅ Your zone valve is failing and causing uneven heating
✅ A valve is making noise — clicking, hissing, or banging
Not sure if your valve needs replacing? Our engineers will assess it honestly and only recommend replacement when necessary.
Common Signs You Need a Valve Replaced
These are the most common symptoms our customers report:
- A radiator that won’t heat up or can’t be turned off
- A leaking valve leaving water on the floor or causing damp
- A valve that’s seized and won’t turn
- Uneven heating throughout your home
- Clicking, hissing, or banging from a valve
- A dripping isolation valve under a sink or toilet
- Zone valve failure causing one area to lose heat
If you’re experiencing any of these issues, call AG Heating for a fast, professional valve replacement.
What to Expect from Our Valve Replacement Service
We keep every valve replacement straightforward and stress-free:
- Call or message us — we respond promptly and can often help the same day
- We discuss your valve problem, symptoms, and the affected area
- We agree a convenient date and provide a clear, upfront price
- Our Gas Safe registered engineer arrives on time, fully equipped
- The faulty valve is removed and replaced with a quality part
- We test the system, check for leaks, and confirm everything works correctly
- Everything is explained clearly and left clean and tidy
No jargon. No hidden costs. Just professional valve replacement from engineers you can trust.
Why Choose AG Heating for Valve Replacement?
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Gas Safe Registered
All valve replacements are carried out by Gas Safe registered engineers — fully qualified, insured, and accountable.
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Transparent Pricing
We quote clearly before we start. What we say is what you pay — no surprises.
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Expert Valve Replacement
With 10+ years of experience, we replace all types of valves across heating and plumbing systems.
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Honest Advice
If a valve can be repaired rather than replaced, we’ll tell you — and only recommend full replacement when it’s genuinely needed.
Valve Replacement — Frequently Asked Questions
How long does a valve replacement take?
Most valve replacements take 1–2 hours depending on the type of valve, its location, and whether any additional work is needed to access it.
How much does a valve replacement cost?
Cost depends on the type of valve and complexity of the job. We provide a clear, upfront quote before starting any work — no hidden charges.
My radiator won’t heat up — is it the TRV?
It could be. A stuck or faulty TRV is one of the most common causes of a cold radiator. Our engineers will diagnose the cause and advise whether a replacement TRV is needed.
My isolation valve is leaking — what should I do?
Turn off the water at the mains if possible and call us. A leaking isolation valve needs prompt attention to avoid water damage — we can usually respond the same day.
Do you replace zone valves?
Yes — zone valve failure is a common cause of uneven heating. We replace all types of zone valves on heating systems across London and Hertfordshire.
Can you replace a valve on an older heating system?
Yes — we work on all types of heating systems, including older installations. Our engineers will assess the system and advise on the best approach.
Is my heating system safe while waiting for a valve replacement?
In most cases yes, but if a valve is leaking or a zone valve has failed, it’s best to get it looked at promptly. Call us and we’ll advise based on your specific situation.
Book a Valve Replacement Today
Whether you need a TRV replaced, an isolation valve fixed, or a zone valve on your heating system sorted — AG Heating is ready to help. With 24/7 emergency availability and Gas Safe registered engineers, we respond fast to get your heating or plumbing working again.
☎ Call: 07400 400 430
✉️ Email: info@agheating.co.uk